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1/*
2 * Interface between ext4 and JBD
3 */
4
5#include "ext4_jbd2.h"
6
7#include <trace/events/ext4.h>
8
9int __ext4_journal_get_write_access(const char *where, unsigned int line,
10 handle_t *handle, struct buffer_head *bh)
11{
12 int err = 0;
13
14 if (ext4_handle_valid(handle)) {
15 err = jbd2_journal_get_write_access(handle, bh);
16 if (err)
17 ext4_journal_abort_handle(where, line, __func__, bh,
18 handle, err);
19 }
20 return err;
21}
22
23/*
24 * The ext4 forget function must perform a revoke if we are freeing data
25 * which has been journaled. Metadata (eg. indirect blocks) must be
26 * revoked in all cases.
27 *
28 * "bh" may be NULL: a metadata block may have been freed from memory
29 * but there may still be a record of it in the journal, and that record
30 * still needs to be revoked.
31 *
32 * If the handle isn't valid we're not journaling, but we still need to
33 * call into ext4_journal_revoke() to put the buffer head.
34 */
35int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
36 int is_metadata, struct inode *inode,
37 struct buffer_head *bh, ext4_fsblk_t blocknr)
38{
39 int err;
40
41 might_sleep();
42
43 trace_ext4_forget(inode, is_metadata, blocknr);
44 BUFFER_TRACE(bh, "enter");
45
46 jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
47 "data mode %x\n",
48 bh, is_metadata, inode->i_mode,
49 test_opt(inode->i_sb, DATA_FLAGS));
50
51 /* In the no journal case, we can just do a bforget and return */
52 if (!ext4_handle_valid(handle)) {
53 bforget(bh);
54 return 0;
55 }
56
57 /* Never use the revoke function if we are doing full data
58 * journaling: there is no need to, and a V1 superblock won't
59 * support it. Otherwise, only skip the revoke on un-journaled
60 * data blocks. */
61
62 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
63 (!is_metadata && !ext4_should_journal_data(inode))) {
64 if (bh) {
65 BUFFER_TRACE(bh, "call jbd2_journal_forget");
66 err = jbd2_journal_forget(handle, bh);
67 if (err)
68 ext4_journal_abort_handle(where, line, __func__,
69 bh, handle, err);
70 return err;
71 }
72 return 0;
73 }
74
75 /*
76 * data!=journal && (is_metadata || should_journal_data(inode))
77 */
78 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
79 err = jbd2_journal_revoke(handle, blocknr, bh);
80 if (err) {
81 ext4_journal_abort_handle(where, line, __func__,
82 bh, handle, err);
83 __ext4_abort(inode->i_sb, where, line,
84 "error %d when attempting revoke", err);
85 }
86 BUFFER_TRACE(bh, "exit");
87 return err;
88}
89
90int __ext4_journal_get_create_access(const char *where, unsigned int line,
91 handle_t *handle, struct buffer_head *bh)
92{
93 int err = 0;
94
95 if (ext4_handle_valid(handle)) {
96 err = jbd2_journal_get_create_access(handle, bh);
97 if (err)
98 ext4_journal_abort_handle(where, line, __func__,
99 bh, handle, err);
100 }
101 return err;
102}
103
104int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
105 handle_t *handle, struct inode *inode,
106 struct buffer_head *bh)
107{
108 int err = 0;
109
110 if (ext4_handle_valid(handle)) {
111 err = jbd2_journal_dirty_metadata(handle, bh);
112 if (err)
113 ext4_journal_abort_handle(where, line, __func__,
114 bh, handle, err);
115 } else {
116 if (inode)
117 mark_buffer_dirty_inode(bh, inode);
118 else
119 mark_buffer_dirty(bh);
120 if (inode && inode_needs_sync(inode)) {
121 sync_dirty_buffer(bh);
122 if (buffer_req(bh) && !buffer_uptodate(bh)) {
123 struct ext4_super_block *es;
124
125 es = EXT4_SB(inode->i_sb)->s_es;
126 es->s_last_error_block =
127 cpu_to_le64(bh->b_blocknr);
128 ext4_error_inode(inode, where, line,
129 bh->b_blocknr,
130 "IO error syncing itable block");
131 err = -EIO;
132 }
133 }
134 }
135 return err;
136}
137
138int __ext4_handle_dirty_super(const char *where, unsigned int line,
139 handle_t *handle, struct super_block *sb)
140{
141 struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
142 int err = 0;
143
144 if (ext4_handle_valid(handle)) {
145 err = jbd2_journal_dirty_metadata(handle, bh);
146 if (err)
147 ext4_journal_abort_handle(where, line, __func__,
148 bh, handle, err);
149 } else
150 sb->s_dirt = 1;
151 return err;
152}
1/*
2 * Interface between ext4 and JBD
3 */
4
5#include "ext4_jbd2.h"
6
7#include <trace/events/ext4.h>
8
9/* Just increment the non-pointer handle value */
10static handle_t *ext4_get_nojournal(void)
11{
12 handle_t *handle = current->journal_info;
13 unsigned long ref_cnt = (unsigned long)handle;
14
15 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
16
17 ref_cnt++;
18 handle = (handle_t *)ref_cnt;
19
20 current->journal_info = handle;
21 return handle;
22}
23
24
25/* Decrement the non-pointer handle value */
26static void ext4_put_nojournal(handle_t *handle)
27{
28 unsigned long ref_cnt = (unsigned long)handle;
29
30 BUG_ON(ref_cnt == 0);
31
32 ref_cnt--;
33 handle = (handle_t *)ref_cnt;
34
35 current->journal_info = handle;
36}
37
38/*
39 * Wrappers for jbd2_journal_start/end.
40 */
41static int ext4_journal_check_start(struct super_block *sb)
42{
43 journal_t *journal;
44
45 might_sleep();
46 if (sb->s_flags & MS_RDONLY)
47 return -EROFS;
48 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
49 journal = EXT4_SB(sb)->s_journal;
50 /*
51 * Special case here: if the journal has aborted behind our
52 * backs (eg. EIO in the commit thread), then we still need to
53 * take the FS itself readonly cleanly.
54 */
55 if (journal && is_journal_aborted(journal)) {
56 ext4_abort(sb, "Detected aborted journal");
57 return -EROFS;
58 }
59 return 0;
60}
61
62handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
63 int type, int blocks, int rsv_blocks)
64{
65 journal_t *journal;
66 int err;
67
68 trace_ext4_journal_start(sb, blocks, rsv_blocks, _RET_IP_);
69 err = ext4_journal_check_start(sb);
70 if (err < 0)
71 return ERR_PTR(err);
72
73 journal = EXT4_SB(sb)->s_journal;
74 if (!journal)
75 return ext4_get_nojournal();
76 return jbd2__journal_start(journal, blocks, rsv_blocks, GFP_NOFS,
77 type, line);
78}
79
80int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
81{
82 struct super_block *sb;
83 int err;
84 int rc;
85
86 if (!ext4_handle_valid(handle)) {
87 ext4_put_nojournal(handle);
88 return 0;
89 }
90
91 err = handle->h_err;
92 if (!handle->h_transaction) {
93 rc = jbd2_journal_stop(handle);
94 return err ? err : rc;
95 }
96
97 sb = handle->h_transaction->t_journal->j_private;
98 rc = jbd2_journal_stop(handle);
99
100 if (!err)
101 err = rc;
102 if (err)
103 __ext4_std_error(sb, where, line, err);
104 return err;
105}
106
107handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
108 int type)
109{
110 struct super_block *sb;
111 int err;
112
113 if (!ext4_handle_valid(handle))
114 return ext4_get_nojournal();
115
116 sb = handle->h_journal->j_private;
117 trace_ext4_journal_start_reserved(sb, handle->h_buffer_credits,
118 _RET_IP_);
119 err = ext4_journal_check_start(sb);
120 if (err < 0) {
121 jbd2_journal_free_reserved(handle);
122 return ERR_PTR(err);
123 }
124
125 err = jbd2_journal_start_reserved(handle, type, line);
126 if (err < 0)
127 return ERR_PTR(err);
128 return handle;
129}
130
131static void ext4_journal_abort_handle(const char *caller, unsigned int line,
132 const char *err_fn,
133 struct buffer_head *bh,
134 handle_t *handle, int err)
135{
136 char nbuf[16];
137 const char *errstr = ext4_decode_error(NULL, err, nbuf);
138
139 BUG_ON(!ext4_handle_valid(handle));
140
141 if (bh)
142 BUFFER_TRACE(bh, "abort");
143
144 if (!handle->h_err)
145 handle->h_err = err;
146
147 if (is_handle_aborted(handle))
148 return;
149
150 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
151 caller, line, errstr, err_fn);
152
153 jbd2_journal_abort_handle(handle);
154}
155
156int __ext4_journal_get_write_access(const char *where, unsigned int line,
157 handle_t *handle, struct buffer_head *bh)
158{
159 int err = 0;
160
161 might_sleep();
162
163 if (ext4_handle_valid(handle)) {
164 err = jbd2_journal_get_write_access(handle, bh);
165 if (err)
166 ext4_journal_abort_handle(where, line, __func__, bh,
167 handle, err);
168 }
169 return err;
170}
171
172/*
173 * The ext4 forget function must perform a revoke if we are freeing data
174 * which has been journaled. Metadata (eg. indirect blocks) must be
175 * revoked in all cases.
176 *
177 * "bh" may be NULL: a metadata block may have been freed from memory
178 * but there may still be a record of it in the journal, and that record
179 * still needs to be revoked.
180 *
181 * If the handle isn't valid we're not journaling, but we still need to
182 * call into ext4_journal_revoke() to put the buffer head.
183 */
184int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
185 int is_metadata, struct inode *inode,
186 struct buffer_head *bh, ext4_fsblk_t blocknr)
187{
188 int err;
189
190 might_sleep();
191
192 trace_ext4_forget(inode, is_metadata, blocknr);
193 BUFFER_TRACE(bh, "enter");
194
195 jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
196 "data mode %x\n",
197 bh, is_metadata, inode->i_mode,
198 test_opt(inode->i_sb, DATA_FLAGS));
199
200 /* In the no journal case, we can just do a bforget and return */
201 if (!ext4_handle_valid(handle)) {
202 bforget(bh);
203 return 0;
204 }
205
206 /* Never use the revoke function if we are doing full data
207 * journaling: there is no need to, and a V1 superblock won't
208 * support it. Otherwise, only skip the revoke on un-journaled
209 * data blocks. */
210
211 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
212 (!is_metadata && !ext4_should_journal_data(inode))) {
213 if (bh) {
214 BUFFER_TRACE(bh, "call jbd2_journal_forget");
215 err = jbd2_journal_forget(handle, bh);
216 if (err)
217 ext4_journal_abort_handle(where, line, __func__,
218 bh, handle, err);
219 return err;
220 }
221 return 0;
222 }
223
224 /*
225 * data!=journal && (is_metadata || should_journal_data(inode))
226 */
227 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
228 err = jbd2_journal_revoke(handle, blocknr, bh);
229 if (err) {
230 ext4_journal_abort_handle(where, line, __func__,
231 bh, handle, err);
232 __ext4_abort(inode->i_sb, where, line,
233 "error %d when attempting revoke", err);
234 }
235 BUFFER_TRACE(bh, "exit");
236 return err;
237}
238
239int __ext4_journal_get_create_access(const char *where, unsigned int line,
240 handle_t *handle, struct buffer_head *bh)
241{
242 int err = 0;
243
244 if (ext4_handle_valid(handle)) {
245 err = jbd2_journal_get_create_access(handle, bh);
246 if (err)
247 ext4_journal_abort_handle(where, line, __func__,
248 bh, handle, err);
249 }
250 return err;
251}
252
253int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
254 handle_t *handle, struct inode *inode,
255 struct buffer_head *bh)
256{
257 int err = 0;
258
259 might_sleep();
260
261 set_buffer_meta(bh);
262 set_buffer_prio(bh);
263 if (ext4_handle_valid(handle)) {
264 err = jbd2_journal_dirty_metadata(handle, bh);
265 /* Errors can only happen due to aborted journal or a nasty bug */
266 if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
267 ext4_journal_abort_handle(where, line, __func__, bh,
268 handle, err);
269 if (inode == NULL) {
270 pr_err("EXT4: jbd2_journal_dirty_metadata "
271 "failed: handle type %u started at "
272 "line %u, credits %u/%u, errcode %d",
273 handle->h_type,
274 handle->h_line_no,
275 handle->h_requested_credits,
276 handle->h_buffer_credits, err);
277 return err;
278 }
279 ext4_error_inode(inode, where, line,
280 bh->b_blocknr,
281 "journal_dirty_metadata failed: "
282 "handle type %u started at line %u, "
283 "credits %u/%u, errcode %d",
284 handle->h_type,
285 handle->h_line_no,
286 handle->h_requested_credits,
287 handle->h_buffer_credits, err);
288 }
289 } else {
290 if (inode)
291 mark_buffer_dirty_inode(bh, inode);
292 else
293 mark_buffer_dirty(bh);
294 if (inode && inode_needs_sync(inode)) {
295 sync_dirty_buffer(bh);
296 if (buffer_req(bh) && !buffer_uptodate(bh)) {
297 struct ext4_super_block *es;
298
299 es = EXT4_SB(inode->i_sb)->s_es;
300 es->s_last_error_block =
301 cpu_to_le64(bh->b_blocknr);
302 ext4_error_inode(inode, where, line,
303 bh->b_blocknr,
304 "IO error syncing itable block");
305 err = -EIO;
306 }
307 }
308 }
309 return err;
310}
311
312int __ext4_handle_dirty_super(const char *where, unsigned int line,
313 handle_t *handle, struct super_block *sb)
314{
315 struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
316 int err = 0;
317
318 ext4_superblock_csum_set(sb);
319 if (ext4_handle_valid(handle)) {
320 err = jbd2_journal_dirty_metadata(handle, bh);
321 if (err)
322 ext4_journal_abort_handle(where, line, __func__,
323 bh, handle, err);
324 } else
325 mark_buffer_dirty(bh);
326 return err;
327}